<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8"/>
    <title>更新时的一个问题</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
<!-- 准备好一个容器-->
<div id="root">
    <h2>人员列表</h2>
    <button @click="updateMei">更新马冬梅的信息</button>
    <ul>
        <li v-for="(p,index) of persons" :key="p.id">
            {{p.name}}-{{p.age}}-{{p.sex}}
        </li>
    </ul>
</div>

<script type="text/javascript">
    Vue.config.productionTip = false

    const vm = new Vue({
        el: '#root',
        data: {
            persons: [
                {id: '001', name: '马冬梅', age: 30, sex: '女'},
                {id: '002', name: '周冬雨', age: 31, sex: '女'},
                {id: '003', name: '周杰伦', age: 18, sex: '男'},
                {id: '004', name: '温兆伦', age: 19, sex: '男'}
            ]
        },
        methods: {
            updateMei() {
                // this.persons[0].name = '马老师' //奏效
                // this.persons[0].age = 50 //奏效
                // this.persons[0].sex = '男' //奏效
                // this.persons[0] = {id:'001',name:'马老师',age:50,sex:'男'} //不奏效
                this.persons.splice(0, 1, {id: '001', name: '马老师', age: 50, sex: '男'})
            }
        }
    })

</script>
</body>
</html>